STANDLEY TREES AND SHRUBS OF MEXICO. 605 



Lobe of the appendix bipartite. 

 Colored floral bracts absent. 



Peduncle centrally affixed to the involucre tube 8. P. macrocarpus. 



Peduncle affixed posteriorly to the tube. 

 Appendix projecting along the margin of the fissure— 9. P. aphyllus. 

 Appendix not projecting along the margin of the fissure. 



Tube of the appendix glabrous inside 10. P. nodiflorus. 



Tube pubescent inside 11. P. cymbiferus. 



Colored floral bracts present, conspicuous, exceeding the inflorescence. 

 Involucral tube glabrous. 



Glands of the appendix 2 12. P. articulatus. 



Glands of the appendix 4 13. P. bracteatus. 



Involucral tube puberulent or pilose. 



Capsule with hornlike projections 14. P. spectabilis. 



Capsule without hornlike projections. 



Involucral tube pilose 15. P. pavonis. 



Involucral tube puberulent. 

 Pistillate pedicels pubescent, the staminate ones glabrous. 



Stamens glabrous 16. P. palm.eri. 



Stamens pubescent 17. P. tomentellus. 



Pistillate and staminate pedicels glabrous. 

 Lobes of the appendix all laterally compressed. 



Lobes glabrous 18. P. greggii. 



Lobes puberulent 19. P. olsson-sefEeri. 



Lobes partly linear or flabellate. 



Lateral and fifth lobes of the tube flabellate. 



20. P. involucratus. 

 Lateral and fifth lobes linear 21. P. rubescens. 



1. Pedilanthus finkii Boiss. in DC. Prodr. 15': 1261. 1866. 

 Known only from the type locality, Cordoba, Veracruz. 



Shrub with hollow stems; leaves oblong, 10 to 14 cm. long, acute. 



2. Pedilanthus tithymaloides (L.) Poit. Ann. Mus. Hist. Nat. 19: 390. 1812. 

 Euphorhia tHhynialoides L. Sp. PI. 453. 1753. 



Tamaulipas and perhaps elsewhere. Central America, West Indies, and 

 northern South America. 



Shrub, 1 to 2 meters high ; leaves ovate or oblong, 3.5 to 7.5 cm. long, 

 acute, cuneate at base, glabrous ; involucres purple ; capsule 9 mm. broad. 

 " Candelilla " (Tamaulipas); " dictamno " (Nicaragua); " bitamo " (Costa 

 Rica); " Itamo real," " gallito Colorado" (Cuba); " dfctamo real" (Cuba, 

 Colombia) ; pie de niiio " (Guatemala) ; " pouopinito " (Venezuela). 



The milky juice is caustic, irritant, and emetic, and is sometimes used in 

 domestic medicine. It is employed in some regions for venereal diseases. The 

 plant is sometimes cultivated under the names " slipper-plant," " bird-cactus," 

 " redbird cactus," and " Jew-bush." 



3. Pedilanthus parasiticus Klotzsch & Garcke, Monatsb. Akad. Berlin 253. 1859. 

 Pedilanthus ramosissimus Boiss. in DC. Prodr. 15': 5. 1862. 



Known only from! the type collection, which is said to have come from 

 Mexico. 



Leaves 2.5 cm. long or shorter, rounded or subcordate at base. 



4. Pedilanthus pring-lei Robinson, Proc. Amer. Acad. 29: 322. 1894. 



Oaxaca to San Luis Potosi ; type from Las Palmas, San Luis Potosl. 

 Guatemala. 



